Opel will give evidence to German authorities investigating emissions tampering.
About 60,000 diesel models with Euro6 engines are thought to be affected and NOx limits are reported to be ten-times statutory levels.
Bosch has been ordered to hand over e-mails with Porsche over software settings for engine management.
Investors taking court action against the VW Group luxury car maker say it did not act soon enough to limit damage to reputation and sales, ruled German authorities.
BMW and MB have been paying 40% duties on models traded between the US and China.
They are made in each country and exported to the other, but the two have been locked in a trade war since the beginning of July, and now the car makers are rethinking production allocations to overcome the export penalties.
Insurethebox reveals that 18.8% of young drivers don’t worry about the danger of failing to notice motorcyclists on the road.
Under half aged 18-24 check for motorcyclists before opening their car door.